There is a rumor that someone in Japan has the prototype. It is not confirmed in anyway and it could easily be a lie. Even if this person does have it, it would barely be playable, simply because a former public relations publicist for Squaresoft stated that it never made it far into development (in fact, she stated that no actual coding was done, making the screenshot most likely conceptual.) She even said that the airship buying idea wasn't even part of the plan.